2.29.0
BackboneElement

The
base
definition
for
complex
elements
defined
as
part
of
a
resource
definition
-
that
is,
elements
that
have
children
that
are
defined
in
the
resource.
Data
Type
elements
do
not
use
this
type,
though
a
few
data
types
specialize
it
(
Timing
,
Dosage
,
ElementDefinition
).
For
instance,
Patient.contact
is
an
element
that
is
defined
as
part
of
the
patient
resource,
so
it
automatically
has
the
type
BackboneElement
.

Note
that
the
descendant
types
of
BackboneElement
are
all
declared
implicitly
as
part
of
the
definitions
of
the
resources.